package com.rabbitmq.demon.one2many;

import com.rabbitmq.client.Channel;
import com.rabbitmq.client.Connection;
import com.rabbitmq.client.ConnectionFactory;
import com.rabbitmq.client.MessageProperties;

/**
 * @author gavinli on 2017/10/9 上午11:45
 *         Producer
 *         1、使用“task_queue”声明了另一个Queue，因为RabbitMQ不容许声明2个相同名称、配置不同的Queue
 *         2、使"task_queue"的Queue的durable的属性为true，即使消息队列durable
 *         3、使用MessageProperties.PERSISTENT_TEXT_PLAIN使消息durable
 *         When RabbitMQ quits or crashes it will forget the queues and messages unless you tell it not to. Two things are required to make sure that messages aren't lost: we need to mark both the queue and messages as durable.
 */
public class NewTask {
    private static final String TASK_QUEUE_NAME = "task_queue";


    public static void main(String[] argv) throws Exception {

        ConnectionFactory factory = new ConnectionFactory();
        factory.setHost("localhost");
        Connection connection = factory.newConnection();
        Channel channel = connection.createChannel();

        channel.queueDeclare(TASK_QUEUE_NAME, true, false, false, null);

        String message = getMessage(argv);

//        for (int i = 0; i < 10; i++) {
        channel.basicPublish("", TASK_QUEUE_NAME,
                MessageProperties.PERSISTENT_TEXT_PLAIN,
                message.getBytes());
        System.out.println(" [x] Sent '" + message + "'");
//        }


        channel.close();
        connection.close();
    }

    private static String getMessage(String[] strings) {
        if (strings.length < 1)
            return "Hello World!";
        return joinStrings(strings, " ");
    }

    private static String joinStrings(String[] strings, String delimiter) {
        int length = strings.length;
        if (length == 0) return "";
        StringBuilder words = new StringBuilder(strings[0]);
        for (int i = 1; i < length; i++) {
            words.append(delimiter).append(strings[i]);
        }
        return words.toString();
    }
}